Hi. I have a suggestion for you if you make your own pressing surface from wood, batting, and a cover. Before you add the batting and fabric, first put a layer of heavy-duty aluminum foil covering the wood. Put it shinier side outward. This way, you will protect your wood from moisture if you use steam or sprayed water. Also, the shiny side of the foil will reflect a little more heat back to what you are pressing, making your setup a little more efficient.
I did that when I made my "big board" topper for my regular ironing board, and it works great.
Happy travels.
...dany